If you are wanting to delve into the Golden Age of Detective fiction, do not make this book your starting point. Ngaio Marsh had certainly gone off the boil when she wrote it and while a late sixties view of Rome is of some interest, the hippy slang is quite painful and Alleyn himself, without either his side-kick, Fox, or his artist wife, Troy, lacks substance. The other characters are fairly cardboard, though the romance of Sophie Jason and Barnaby Grant the writer is appealling.
Rome, of course, is a fascinating background for any book but by itself it cannot carry the story.